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(CBS NEWS) -- A friend of Boston bombing suspect Tamerlan Tsarnaev implicatedhimself and Tsarnaev in an unsolved triple homicide before authoritiessay he instigated a violent confrontation that resulted in his deathearly Wednesday morning, CBS News correspondent Bob Orr reports.

Lawenforcement sources told Orr that the man, a Chechen identified asIbragim Todashev, implicated himself and Tsarnaev to authorities in the2011 killings in Waltham, Mass., under questioning Wednesday atTodashev's apartment in Orlando, Florida.

Authorities went tothe apartment after having obtained what the sources described asstrong evidence to suggest that Todashev, Tsarnaev and his brotherDzhokhar were involved in the killings on the tenth anniversary of theSept. 11, 2001, terror attacks. The FBI had already interviewed Todashevmore than once before Wednesday.

The sources also said that authorities have no evidence tyingTodashev to last month's deadly terrorist bombing at the Boston Marathonthat the Tsarnaev brothers are accused of carrying out.

Sometimeafter midnight Wednesday morning in Orlando, an FBI special agent fromthe bureau's Boston field office was accompanied by at least twotroopers from the Massachusetts State Police and a Joint Terrorism TaskForce agent to question Todashev, the sources said. The questioningprimarily focused on the 2011 killings.

While the FBI'sinvestigation into Wednesday's shooting is ongoing, the preliminarydetails are that after Todashev implicated himself and Tamerlan Tsarnaevhe became angered when authorities pressed him for a full confession,the sources said. Todashev brandished a knife, prompting the officialsto feel that their lives were in danger.

The FBI agent then shot Todashev and received some minor abrasions in the process, the sources said.

TheTsarnaev brothers and Todashev apparently knew the three people killedin Waltham, the sources said, describing the 2011 killings as brutal andgrisly, with all three bodies nearly decapitated. The bodies hadmarijuana and thousands of dollars in cash sprinkled on them.

Todashev lived in the Boston area at the time of the killings and wasfriends with Tamerlan Tsarnaev, who died in a shootout with authoritiesin the days after the April 15 marathon attack. It's unclear what kindof a relationship Todashev had with Dzhokhar Tsarnaev, who remains infederal custody awaiting trial.

Earlier, CBS News seniorcorrespondent John Miller reported that Todashev was amixed-martial-arts fighter. Fighting was at least one interest thatTodashev shared with Tamerlan Tsarnaev, who was once a boxer.

Milleralso reported that Todashev had been to Chechnya before and wasscheduled to return to Chechnya this week but canceled his flight.

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